Stomachs produce gastric acid to aid in digestion. This acid is mainly com-posed of hydrochloric…

Stomachs produce gastric acid to aid in digestion. This
acid is mainly com-posed of hydrochloric acid that is secreted by cells of the
stomach lining called parietal cells. Excessive secretion of this acid is
common and can lead to many stomach problems such as gastritis, gastric ulcers,
and peptic acid disease. These disorders are treated with antacid tablets,
which contain weak bases that can help neutralize acids. A common antacid
tablet contains the weak base magnesium hydroxide, Mg(OH)2. The neutralization reaction for stomach
hydrochloric acid (HCl) is:

Mg(OH)2 + 2 HCl  MgCl2 +
»

Stomachs produce gastric acid to aid in digestion. This
acid is mainly com-posed of hydrochloric acid that is secreted by cells of the
stomach lining called parietal cells. Excessive secretion of this acid is
common and can lead to many stomach problems such as gastritis, gastric ulcers,
and peptic acid disease. These disorders are treated with antacid tablets,
which contain weak bases that can help neutralize acids. A common antacid
tablet contains the weak base magnesium hydroxide, Mg(OH)2. The neutralization reaction for stomach
hydrochloric acid (HCl) is:

Mg(OH)2 + 2 HCl  MgCl2 +
2 H2O

Characterize the continuous acid neutralizing process in
the stomach using definitions from Chapter 2 (e.g., open or closed,
steady-state or dynamic, reacting or non-reacting). For what species or
elements can you write conservation equations? For what species must you write
accounting statements?

3.2 Arterioles bifurcate (i.e., split) into capillaries
in the circulatory system. Blood flows at a velocity of 20 cm/s through an
arteriole with a diameter of 0.20 cm. This vessel bifurcates into two vessels:
one with a diameter of 0.17 cm and a blood flow velocity of 18 cm/sec, and one
with a diameter of 0.15 cm. Each of these two vessels splits again. The 0.17-cm
diameter vessel splits into two vessels, each with a diameter of 0.15 cm. The
0.15-cm diameter vessel splits into two vessels, each with a diameter of 0.12
cm. Determine the mass flow rate and velocity of blood in each of the four
vessels at the end of the arteriole bifurcations. You may need to set up
several systems, each with a different system boundary, in order to solve this
problem.

 

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